TYPECICS

BWO processing is used for CICS® VSAM file control data sets. SMS rejects dynamic or JCL allocations if, as the result of an alter function, the value for LOG is changed to ALL without a logstream ID being available, or if the logstream ID is nullified.

TYPEIMS

BWO processing is used for IMS™ VSAM data sets.

Note: Support for this option is only available with IMS 6.1 or above.

NO

BWO is not used for CICS VSAM file control or IMS VSAM data sets. This is the default.

ALL

Tells VSAM to do both forward and backward recovery logging. Changes made by applications are written to the MVS log stream indicated on the logstream ID parameter.

NONE

Disables the VSAM batch logging function for your VSAM data set. Changes made by applications are not written to the MVS log stream indicated on the logstream ID parameter.

REDO

Tells VSAM to do forward recovery logging. Changes made by applications are written to the MVS log stream indicated on the logstream ID parameter.

UNDO

Tells VSAM to do backward recovery logging. Changes made by applications are written to the MVS log stream indicated on the logstream ID parameter.

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The FRlog value in the catalog is used.

There is no default JCL value. If FRlog is omitted, the catalog value is used.

For data sets defined using access method services, the Log and Logstream ID attributes in the data class are merged with those defined in the DEFINE command. If a single logstream is to be used for each VSAM data set, the logstream ID should be specified on the DEFINE command. Specify the logstream ID in the data class only if the same logstream ID is to be used for many data sets. Otherwise, this will result in too many data classes.

Additionally, SMS rejects dynamic or JCL allocations if, as the result of an alter function, the value for LOG is changed to ALL without a logstream ID being available, or if the logstream ID is nullified. Specify one of the following:

NONE

Indicates that neither an external backout nor a forward recovery capability is available, so the data set is not considered recoverable

UNDO

Indicates that changes can be backed out using an external log, so the data set is considered recoverable

ALL

Indicates that changes can be backed out and forward recovered using an external log

If you specify Log(ALL), you must specify a logstream ID, either on the access method services DEFINE command or in the Logstream ID field in the data class.

blank

The data set is not recoverable. This is the default.

A logstream ID is made up of 1-to-26 characters, including separators. This name is made up of one or more segments, each containing one to eight alphabetic, numeric, or national characters. The first character of each segment must be an alphabetic or national character. Segments are joined by periods.

For data sets defined using access method services, the attributes in the data class are merged with those defined in the DEFINE command. If a single logstream is to be used for each VSAM data set, the logstream ID should be specified on the DEFINE command. Specify the logstream ID in the data class only if the same logstream ID is to be used for many data sets. Otherwise, this will result in too many data classes.

Y

Yes, data set is eligible for VSAM replication.

N

No, data set is not eligible for VSAM replication. This is the default.